If you ever need to pick up small items such as beads, shells, or small electronic components for future use, you probably don't want sift through the dust and debris in your regular vacuum. A commercial vacuum pen goes for $40-60 but you can utilize a $10 air filter to create your own.

Instructables user technicallyartistic goes into detailed step-by-step photos and instructions at the source link below, but what you're basically doing is opening up the pump and reversing the valve so it goes from blowing air to sucking air. Next you'll create the pen itself by using a donor refillable pen, an airflow control valve, an inflation needle, and an alligator clip. Finally, you'll need a length of air hose tubing and a t-valve to add the vacuum pump to your pen.